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authorM'boumba Cedric Madianga <cedric.madianga@gmail.com>2017-01-05 11:09:40 +0300
committerVinod Koul <vinod.koul@intel.com>2017-01-10 08:20:47 +0300
commit5df4eb453cbdad34ea55c0ce984a376b33442aa1 (patch)
tree8477a1e3e0ebf825ab8e2e7688a136b4d7d1c243
parent276b0046ff7765c1d42ed48c67b4b5f3b50ea461 (diff)
downloadlinux-5df4eb453cbdad34ea55c0ce984a376b33442aa1.tar.xz
dmaengine: stm32-dma: Add error messages if xlate fails
This patch adds some error messages when a slave device fails to request a channel. Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com> Reviewed-by: Ludovic BARRE <ludovic.barre@st.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
-rw-r--r--drivers/dma/stm32-dma.c24
1 files changed, 15 insertions, 9 deletions
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index fc9738e0f3a3..4eacd9dd5710 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -987,30 +987,36 @@ static struct dma_chan *stm32_dma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct stm32_dma_device *dmadev = ofdma->of_dma_data;
+ struct device *dev = dmadev->ddev.dev;
struct stm32_dma_cfg cfg;
struct stm32_dma_chan *chan;
struct dma_chan *c;
- if (dma_spec->args_count < 3)
+ if (dma_spec->args_count < 4) {
+ dev_err(dev, "Bad number of cells\n");
return NULL;
+ }
cfg.channel_id = dma_spec->args[0];
cfg.request_line = dma_spec->args[1];
cfg.stream_config = dma_spec->args[2];
- cfg.threshold = 0;
+ cfg.threshold = dma_spec->args[3];
- if ((cfg.channel_id >= STM32_DMA_MAX_CHANNELS) || (cfg.request_line >=
- STM32_DMA_MAX_REQUEST_ID))
+ if ((cfg.channel_id >= STM32_DMA_MAX_CHANNELS) ||
+ (cfg.request_line >= STM32_DMA_MAX_REQUEST_ID)) {
+ dev_err(dev, "Bad channel and/or request id\n");
return NULL;
-
- if (dma_spec->args_count > 3)
- cfg.threshold = dma_spec->args[3];
+ }
chan = &dmadev->chan[cfg.channel_id];
c = dma_get_slave_channel(&chan->vchan.chan);
- if (c)
- stm32_dma_set_config(chan, &cfg);
+ if (!c) {
+ dev_err(dev, "No more channel avalaible\n");
+ return NULL;
+ }
+
+ stm32_dma_set_config(chan, &cfg);
return c;
}